根茬粉碎还田机灭茬甩刀喷焊NiWC工艺优化

Technology optimization and test of the cutter of machine for chopping and returning stubble into soil by flame spraying and remelting NiWC alloy coating

摘要: 为解决根茬粉碎还田机灭茬刀成本高、寿命短的问题，在45#钢制造的根茬还田刀具易磨损部位喷焊了NiWC合金抗磨涂层。正交试验和方差分析结果表明，试验因素对喷焊层耐磨性的影响程度大小依次为WC的含量、乙炔流量、预热温度和喷涂距离。优化后喷焊工艺参数为：涂层配比为Ni60 +35%WC，预热温度为450℃，乙炔流量为1000 L/h，喷涂距离为40 mm。

Abstract: In order to solve the problem that the Machine for Chopping and Returning Stubble into Soil is high-priced and short-lifetime, wear-resistance coating was made on the substrate of 45# steel by flame spraying and remelting NiWC alloy. By means of orthogonal test and multiple factors variance analysis, how the test factors influence wear-resistance was studied, and the influence from high to low is the content of WC, the acetylene flow, the preheating temperature and the spraying distance. The technology parameters of flame spraying and remelting NiWC alloy were optimized as follows: coating matching, Ni60+35%WC; preheating temperature, 450℃; acetylene flow, 1000 L/h; spraying distance, 40 mm.